Alert archive / Maryland / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 55, NWS Philadelphia/Mount Holly

June 28, 2013Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2013, 4:50 PM EDT for Cecil County, Maryland. It was in force for 55 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 28, 2013, 4:50 PM EDT (20:50 UTC)
Expired
Jun 28, 2013, 5:45 PM EDT
In force
55 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

County Cecil County, MD

The radar

The Dover AFB radar (KDOX), 99 km from the middle of the area, began a volume at 20:50 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 28, 2:08 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.8 hours before the alert went out and 148 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2013-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 34 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2013-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
34 J/kg
Mixed-layer CIN
-140 J/kg
Mixed-layer LCL
1246 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

548 
WUUS51 KPHI 282050
SVRPHI
MDC015-282145-
/O.NEW.KPHI.SV.W.0055.130628T2050Z-130628T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
450 PM EDT FRI JUN 28 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CECIL COUNTY IN NORTHEAST MARYLAND...

* UNTIL 545 PM EDT

* AT 446 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR WOODLAWN...MOVING EAST AT
  25 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND
  HAIL. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FARMINGTON AROUND 455 PM EDT...
  BAY VIEW AND ZION AROUND 500 PM EDT...
  NORTH EAST AROUND 505 PM EDT...
  PLEASANT HILL AROUND 510 PM EDT...
  CHERRY HILL AND ANDORA AROUND 515 PM EDT...
  ELKTON AND BARKSDALE AROUND 520 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEASTERN PENNSYLVANIA.

&&

LAT...LON 3972 7580 3948 7579 3959 7611 3968 7611
TIME...MOT...LOC 2050Z 269DEG 22KT 3963 7605

$$

FORECASTER:JJM
2 follow-up statements
449 
WWUS51 KPHI 282107
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
507 PM EDT FRI JUN 28 2013

MDC015-282145-
/O.CON.KPHI.SV.W.0055.000000T0000Z-130628T2145Z/
CECIL MD-
507 PM EDT FRI JUN 28 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR NORTHERN CECIL COUNTY...

AT 502 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM. THIS STORM WAS LOCATED NEAR BAY
VIEW...OR 10 MILES WEST OF NEWARK...MOVING EAST AT 35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
BARKSDALE AND ELKTON AROUND 515 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXPECT STRONG WINDS IN EXCESS OF 58 MPH...INTENSE LIGHTNING...AND 
HEAVY RAIN. DO NOT DRIVE YOUR CAR THROUGH FLOODED ROADWAYS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEASTERN PENNSYLVANIA.

&&

LAT...LON 3972 7580 3948 7579 3959 7611 3968 7611
TIME...MOT...LOC 2106Z 280DEG 32KT 3965 7590

$$

FORECASTER:JJM
372 
WWUS51 KPHI 282133
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
533 PM EDT FRI JUN 28 2013

MDC015-282143-
/O.CAN.KPHI.SV.W.0055.000000T0000Z-130628T2145Z/
CECIL MD-
533 PM EDT FRI JUN 28 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CECIL COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT
OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEASTERN PENNSYLVANIA.

LAT...LON 3972 7580 3948 7579 3959 7611 3968 7611
TIME...MOT...LOC 2133Z 280DEG 32KT 3961 7559

$$

FORECASTER:JJM

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 28, 3:19 PM EDTSevere Thunderstorm WarningPHICecil41 min
Jun 28, 4:20 PM EDTSevere Thunderstorm WarningPHICecil55 min
Jun 28, 4:27 PM EDTTornado WarningPHICecil33 min
Jun 28, 4:47 PM EDTSpecial Weather StatementPHICaroline, Kent, Queen Anne's, Talbot73 min
Jun 28, 5:09 PM EDTFlash Flood WarningPHICecil11 hr
Jun 28, 5:14 PM EDTSevere Thunderstorm WarningPHICaroline, Queen Anne's, Talbot46 min
Jun 28, 6:09 PM EDTSevere Thunderstorm WarningPHICaroline96 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2013Every severe thunderstorm warning in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.